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Re:Ask HN: Self-taught webdev with lots of free time. What s... by dkubb on Wednesday August 12, 2020 @02:33PM (#24135220)
I would recommend SQL and Relational Theory by CJ Date.

It completely changed how I use SQL. Before reading it, I had about a decade of experience with SQL. I didn't really understand the theory underneath. I also didn't understand how to write SQL in a way that adheres to the theory.

You can think of this book as being the closest we have to "SQL: The Good Parts".

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